A device which controls the voltage and current being delivered to a capacitor or battery.

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2answers
66 views

Voltage regulator question

I have made a portable device charger with a 5 volt voltage regulator(7805-TO220 package),a 9 volt battery and a few capacitors.The problem is,when I connect the charger to a certain device(whose ...
0
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0answers
38 views

Single IC solution: Li-Poly / Solar charge and management [closed]

I'm making a discrete device which will manage a room light (up to 2A LED) from solar cells and which will switch to battery once solar cell voltage drops below 10V. An op-amp with hysteresis used as ...
0
votes
0answers
35 views

Are USB chargers interchangeable? [closed]

It's common today for devices that require USB charging to come with a USB cable but no wall charger. For example I bought a Bluetooth headset that comes with a cable and no wall charger and the ...
0
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0answers
52 views

SLA (Sealed Lead Acid) Battery Float/Trickle Charger Design

I would like to replace an unregulated transformer-based built-in charger in an emergency LED lamp. The biggest problem with the original charger is that when the current tapers off, the voltage ...
1
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2answers
62 views

Can I keep my charger plugged in? [closed]

If I keep my charger plugged in while my phone is not connected, it does not heat up. So, it is safe to keep the charger plugged while it is not connected to the phone? Will it draw current?
-1
votes
1answer
62 views

can i use 12v battery while charging? [closed]

hello guys i have 70AH 12V battery and i have triple phase charger can charge from (0 to 140 ah batteries ) the chager turn off automatically when the battery full charge and i have 12V to 220 V ...
1
vote
1answer
37 views

Do I need any special equipment to make my circuit run off power from a phone/laptop charger?

Is it safe for one to replace a 5v battery source with a phone charger without installing any other components to prevent power surges or injury to any people in contact with the device? Also, is it ...
1
vote
2answers
328 views

Determining voltage of fuse

My car battery is dead, and the fuse in my car battery charger is missing....(don't ask me why) I have a 20A fuse lying around and a 7.5A fuse that I took out of the car. The car battery charger ...
-1
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0answers
32 views

Charger failure safety measures

Suppose I use a charger to power a circuit and suddenly a component inside fails and the 220 volts can easily reach my project,flowing trough the now broken charger.What can I put between the charger ...
0
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2answers
22 views

MAX1555 - High level logic output

I plan to use the MAX1555 chip The chip output a logic bit to indicate if current is pull from the charger ( POK pin- Chip 1551 , CHG pin - chip 1555) The datasheet talk about the low state, being ...
0
votes
1answer
75 views

Does increasing AWG increase temperature?

My laptop charger connector broke, so I bought a new connector. However, I noticed that the new connector's wires were thinner than that of the existing charger. The laptop charges, but the charger ...
4
votes
2answers
337 views

Verify this charging circuit

This is the circuit I have designed. I want to be sure whether I have designed it properly or not. Here is the Purpose: I am trying to power a Network device 24 hours which requires 9v (600ma). I ...
0
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2answers
55 views

Solar Panel + Controller + Diode to float LiPos

I have a few solar panels I wanted to play around with and charge some 18650s till I get a little more comfortable that I won’t blow something up. My main goal is to understand how to charge ...
0
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1answer
45 views

How battery-charger system in mobile phones and laptops works?

It was 5 am in the morning stuck at McD and waiting for the train with my friends. All out of nowhere I asked them this question that I have been thinking about for some time. How this ...
-1
votes
1answer
67 views

ReusingLithium Polymer battery from an Old Tablet

One of the projects that I am currently working on requires a backup battery source. I have 2 tablets with me that's that's dead (cracked screen) and the Asus one had a 4270mAh battery. I was trying ...
0
votes
1answer
77 views

Detect sudden change in current and send signal to arduino

I am trying to make a smart power socket using Arduino. The socket should power even high power equipments at 230 Volt 50hz through a relay. I want my arduino to analyse the amount of current taken ...
2
votes
2answers
581 views

Will the lower frequency of 50Hz AC affect overall charging time? [closed]

I'm using a voltage converter to go from 220V to 110V to charge a small appliance. The recommended charging time is 6-8 hours. However, this is specified for US AC voltage 110V@60Hz, whereas the ...
2
votes
3answers
109 views

Phone travel charger for powering circuits dangers

I am thinking of using a phone travel charger to power a circuit.Ratings: input:110-240VAC(my outlet has 220volts) 50/60Hz 0,3A output:DC 5,2volts at 400mA The problem is that 220 V are of course ...
0
votes
1answer
41 views

Backup battery charger

I'm trying to design some kind of backup battery charger - please see the image: Normally, the DC supply is ON, and provides current for load and also charges the battery. Battery should be charged ...
1
vote
1answer
57 views

LiPO reverse polarity protection with P-Fet & charger

I am trying to use a P-FET to protect my circuit against reverse polarity like such: Now i would like to add a LiPo charger to this circuit. Can i just add it after the P-FET (@+Vbatprotected)? ...
0
votes
1answer
76 views

LM386 noise when using 5v power supply

I'm using LM386 with my guitar and currently I power it with 9v battery but now I want to switch to 5v power supply because I don't want to use a battery. I want to use a 5v usb wall charger + ...
0
votes
1answer
59 views

Schmitt trigger design to control lead acid battery charger

I've found a very good explanation on schmitt trigger circuit design here -What is a Schmitt Trigger and its application exactly? But the design is done considering same reference voltage and the ...
0
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0answers
48 views

Handmade usb charger

I am a mechanical engineer and I don't have so many knowledge on electronics. I tried to make a solar charger . I had a 12v12ah battery,a solar panel 20w, a battery charger and a dc-dc converter ...
0
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2answers
100 views

Li-Ion battery charging as simple as possible

I have read articles here and there about charging Li-Ion batteries. Most of them try to solve the problem of maximizing capacity and also maximizing cycles. The most recommended method is charging ...
0
votes
1answer
72 views

Name of the Samsung Galaxy end of charger [closed]

This is probably a weird question to ask but I am looking for the end "jack" of the Samsung Galaxy S3, S4 etc charger name. Is not the USB side of the cable, is the actual bit which goes inside the ...
0
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0answers
16 views

Would this be a suitable replacement? (Power adaptor) [duplicate]

I've been scouring the internet for a solution to my problem, but to no avail. I hope I'm posting this in the right section too. So I have a TV which won't turn on, and I have determined its because ...
0
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0answers
44 views

PWM lithium-ion charger

I want to make a custom lithium-ion 18650 standard cell charger as I will be charging 100s of them (recycling old laptop batteries). Base on my research, lithium-ion cells use constant-current, ...
0
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2answers
90 views

charging battery directly from a source, what could go wrong?

I have a 100A lead acid deep cycle battery and also have a car's 12V 100A charger (alternator with AVR) At 1500RPM the alternator will produce nearly 100A.. and the battery is directly connected to ...
0
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0answers
31 views

charge controller not disconnecting at full

When testing batteries and charge controllers I stumbled into something, this is what I found: 12V 100A battery charged using solar system with a charge controller in between, at 13.4V or ...
0
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0answers
36 views

Does the battery protection circuitry work automatically within this Li-Ion charger IC (STNS01)?

I want to use the STNS01 Li-Ion Charger/LDO regulator in my circuit for its protection circuitry including overcurrent, overdischarge, overcharge, and over temperature circuitry. However, I can't ...
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votes
1answer
54 views

Connecting OverCharging kit with charger [closed]

I Have one battery of 12V and 3.5 A. I purchased charger whose output is 12V and 3A. I also purchased overcharging kit. But dont know how to connect the overcharging kit with charger. You can see pics ...
0
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0answers
94 views

2S LiPo Charger IC With Built-In Boost (allowing 5V voltage supply)

So before I get to my question, I wanted to give a bit of background info on what I am working with. Basically I have a device which is USB powered. It has an ATMega32u4, and two SN754410 H-Bridge ...
1
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1answer
80 views

Prevent Mobile over charging?

This is my second time changing my mobile because I forgot it all the night on the charger. I know there is an IC or circuit inside my phone that will disconnect the charger once the battery is fully ...
2
votes
2answers
94 views

How to make USB smartphone charger? [duplicate]

I want to make a USB cell phone charger. I know USB operates in 5 volts which means i need to drop down voltage if i have battery potential greater than 5 Volts. I have 12 volts sealed lead acid ...
0
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0answers
32 views

Help with solar panel/battery & load calculations

First solar project and I've been researching for a couple of days but still struggling with some basics. Trying to set up a simple 12v system, maintained by a solar panel. Solar Panel> Charge ...
1
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1answer
72 views

Will a diode conduct if one side is floating and one side has voltage applied to it?

I have a circuit that has a battery output voltage of about 7V and can also have a charger input that when plugged in will output around 9V. The battery/charger power a microcontroller (regulated ...
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votes
1answer
153 views

Can I run a 110v battery charger/maintainer off a solar panel?

I have a Batt Cat II battery charger/maintainer hooked up to the batteries on my boat. I keep it at a storage yard that doesn't have 110v outlets available. I was wondering if it is possible or ...
0
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1answer
140 views

pulse charging lead acid battries effects and side effects

I am developing a solar charger which charges lead acid batteries.I would like to clear a few of doubts on this issue. I am using IR2110 gate driver for driving 2 n-channel mosfets in an half bridge ...
0
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2answers
27 views

Output charger indications

its a small question ...i got on my cell charger the indications as follow: input:100-240 V 50-60 Hz output: 5 V DC 1 A.... the question is what does the 1 A mean? i am new to circuits and ...
7
votes
2answers
389 views

What is the purpose of these forks?

I have disassembled a phone charger today and I have found some interesting feature that I do not understand, I have marked it on the picture. Left side of this structure is connected to P1, that is ...
0
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1answer
93 views

Making a universal USB charger

I would like to make an universal USB charger. I have a 5V, 2A max generator and I can not find any electronic assembly to create a Dedicated Charging Port able to charge Samsung, Apple and other ...
0
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2answers
70 views

DC-DC & Solar Question

I normally am pretty good with electrics and they taught us about them in a few of my classes, specifically my into to engineering courses. I however don't know a ton about solar panels so this ...
-3
votes
1answer
92 views

can i use a 20V, 2.0A for my laptop that needs 19V, 4.74 A? [closed]

i have a laptop that needs 19V and 4.74A my laptop's charger broke and i replaced it with a 20V and 2.0 A the laptop seems fine but i noticed that the charging goes on and off for like an interval or ...
-1
votes
1answer
38 views

18v nimh battery charger [duplicate]

For the 18V +/- NIMH battery pack (2 x 9V packs in series @ 200mAh) that I use to run my phono preamp, I need a simple trickle charge circuit. The LM317 IC seems to be the one that is used a lot. ...
0
votes
2answers
53 views

In a power supply, the current is a constant or gives whats the component/circuit need ? [duplicate]

I everybody, sorry for my english :D . i'm a begginer of electronic and i'm learning a lot of electronic component, voltages, current and so on. My question is about a charger (phone charger for ...
0
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0answers
50 views

Be on the safe side with 12 v battery as powersupply

I have a 12 v battery connected to a LI-PO charger that uses 1.5A. Now i want to make sure i'm not going to fry anything so i want to connect a fuse. Question 1. How do i calculate the value of the ...
0
votes
1answer
91 views

What's the purpose of this bulky cylindrical part near the plug end of a laptop charger cord? [duplicate]

I want to fix my laptop charger cord, I used a multimeter to check the voltage and it gives me less than one volt. It feels very flexible near the plug, but I don't know if I can cut before or after ...
2
votes
1answer
126 views

How to get 5V 4A from two 5V 2A chargers

I have two 5V 2A chargers. I want to get 5v 4A. Can I connect both in parallel like this?: simulate this circuit – Schematic created using CircuitLab Can I do it? Because in parallel ...
1
vote
2answers
61 views

Detecting HI-Z state of charge controller

I have been building a Li-Ion charge controller with MCP73831. The STAT pin has 3 states as shown below: The circuit I come up so far is this: Is there a way to detect the HI-Z state with ...
1
vote
1answer
85 views

Variable Current Lead Acid Battery Charging

I'm designing a solar controller in order to charge SLA batteries. I did some research on dedicated ICs that act as controllers, and found that most implement some sort of MPPT, in order to extract ...